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Synthesis, crystal structure and photoluminescence studies of [Eu(dbm)3(impy)] and its polymer based hybrid film.

Abstract

An eight-coordinate Eu(III) complex with 1,3-dibenzoylmethane (Hdbm) and 2-(1H-imidazol-2-yl) pyridine (impy), [Eu(dbm)3(impy)] was synthesized and characterized by elemental analysis, FTIR, ESI-MS+ and thermal analysis (TGA/DTA). A distorted square antiprismatic structure for the complex is revealed by single crystal X-ray diffraction analysis. In the complex Eu(III) is coordinated to six oxygen atoms of three dbm moieties and pyridyl and imidazolyl nitrogen atoms of impy. The steady state and time resolved photoluminescence of the solid complex, chloroform solution and PMMA hybrid film is presented and discussed. In spite of distorted square antiprismatic structure the 5D0 → 7F2 transition is fairly strong and 5D0 → 7F0 transition is sufficiently strong. The decay time is monoexponential for the solid complex whereas chloroform solution and PMMA hybrid film show biexponential decay fitting. The decay time of 5D0 → 7F2 transition of solid [Eu(dbm)3(impy)] (417 ± 0.5 μs) is seven times longer than that of its precursor [Eu(dbm)3(H2O)] (57 ± 0.09 μs). The intrinsic quantum yield for the ternary complex is larger than the precursor. The solid complex and the PMMA hybrid film emit red color while the chloroform solution emits pink color. The simultaneous emission of white and red light results in pink.

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Publication details

The article was received on 07 Sep 2018, accepted on 23 Dec 2018 and first published on 03 Jan 2019


Article type: Paper
DOI: 10.1039/C8NJ04560G
Citation: New J. Chem., 2019, Accepted Manuscript
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    Synthesis, crystal structure and photoluminescence studies of [Eu(dbm)3(impy)] and its polymer based hybrid film.

    K. Iftikhar and N. Hasan, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C8NJ04560G

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